The Franche-Comté (the former "Free County" of…
July 1556 CE
The Franche-Comté (the former "Free County" of Burgundy, as distinct from the neighboring Duchy) passes in 1556 from the Austrian Habsburgs to the Spanish branch of the family when the abdicating emperor Charles V in July 1554 bestows it upon his son, Philip II, King of Spain.
The Franche-Comté will remain in Spanish hands for most of the next one hundred and twenty years until its final cession to France in 1678 in the Treaty of Nijmegen.